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[Cancer Research 66, 2853-2859, March 1, 2006]
© 2006 American Association for Cancer Research


Epidemiology and Prevention

Chemopreventive Properties of Black Raspberries in N-Nitrosomethylbenzylamine-Induced Rat Esophageal Tumorigenesis: Down-regulation of Cyclooxygenase-2, Inducible Nitric Oxide Synthase, and c-Jun

Tong Chen, Hyejeong Hwang, Miranda E. Rose, Ronald G. Nines and Gary D. Stoner

Cancer Chemoprevention Program, Division of Hematology and Oncology, Department of Internal Medicine, College of Medicine and Public Health, The Ohio State University, Columbus, Ohio

Requests for reprints: Gary Stoner, Cancer Chemoprevention and Support Program, Division of Hematology and Oncology, Department of Internal Medicine, College of Medicine and Public Health, The Ohio State University. CHRI Suite 1141, 300 West 10th Avenue, Columbus, OH 43210. Phone: 614-293-6228; Fax: 614-293-4072; E-mail: gary.stoner{at}osumc.edu.

Our laboratory has used a rodent model of human esophageal squamous cell carcinoma to identify putative chemopreventive agents for this disease and to determine their mechanisms of action. In the present study, we treated F344 rats with the esophageal carcinogen, N-nitrosomethylbenzylamine (NMBA), thrice per week for 5 weeks. Beginning 1 week later, they were fed a synthetic diet containing 5% black raspberries (BRB) for the duration of the bioassay (25 weeks). Rats were sacrificed at weeks 9, 15, and 25. Esophageal tissues were collected, and tumor data were recorded. The expression and enzymatic activities of cyclooxygenase-2 (COX-2) and inducible nitric oxide synthase (iNOS) as well as the expression of c-Jun in the esophagi, were evaluated to investigate the mechanism(s) by which black raspberries modulate tumorigenesis. At week 25, BRB inhibited tumor multiplicity, the standard end point in this tumor model, from 3.78 ± 0.41 tumors per rat in NMBA-treated animals to 2.23 ± 0.21 tumors per rat in animals treated with NMBA plus BRB (P < 0.005). BRB reduced mRNA and protein expression levels of COX-2, iNOS, and c-Jun as well as the level of prostaglandin E2 in preneoplastic lesions of the esophagus at week 25. The berries inhibited mRNA expression of iNOS and c-Jun, but not COX-2, in papillomatous lesions of the esophagus. Prostaglandin E2 and total nitrite levels were also decreased by BRB in papillomas. These results suggest a novel tumor suppressive role of BRB through inhibition of COX-2, iNOS, and c-Jun. (Cancer Res 2006; 66(5): 2853-9)




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Molecular Cancer Research Cancer Prevention Research
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Annual Meeting Education Book Cell Growth & Differentiation
Copyright © 2006 by the American Association for Cancer Research.